Add "Add another account" entry to settings menu

To do: replace the bottom-left "add account" button by something else,
move the corresponding keybind code away

src/gui/MainPane/MainPane.qml

@@ -44,6 +44,7 @@ HDrawer {
         anchors.fill: parent
 
         TopBar {
+            roomList: roomList
             Layout.fillWidth: true
         }
 

src/gui/MainPane/TopBar.qml

@@ -7,6 +7,8 @@ import ".."
 import "../Base"
 
 Rectangle {
+    property RoomList roomList
+
     clip: true
     implicitHeight: theme.baseElementsHeight
     color: theme.mainPane.topBar.background
@@ -25,6 +27,15 @@ Rectangle {
                 id: settingsMenu
                 y: parent.height
 
+                HMenuItem {
+                    icon.name: "add-account"
+                    text: qsTr("Add another account")
+                    onTriggered: {
+                        pageLoader.show("Pages/AddAccount/AddAccount.qml")
+                        roomList.startCorrectItemSearch()
+                    }
+                }
+
                 HMenuItem {
                     icon.name: "more-settings"
                     text: qsTr("Open configuration folder")